Biggest problem there is: Settler AI.

[Pentegass]

As a modded-builder, I find that the AI in game is pretty dumb for settlers, they do not know where is wall where is stair or door in that matter, my question is that, is it possible to add a mod, which allows the builder to place invisible walls which directly corralates with the settler AI, making them understand they wont be able to walk there, like an impassable object. Therefore we could be able to arrange where they need to walk and not. Because I'm building big, and detailed, my settlers get stuck into walls all the time. They simply do not understand the wall-foundation as a blocker.